Pin-lock



(No Model.)

lJ. J. RIDGWAY.

PIN LOCK. No. 541,630. Patented June 25,1895.

. immuun@ 1 l :-1 A/LEIEE//f cams verras cn Umano STATES VPATENT Ormea JOI-IN J. RIDGWAY, OF NEV BRIGHTON, NEW YORK.

PIN-LOCK.

SPECIFICATION forming part of Letters Patent No. 541,630, dated J' une 25, 1895. v

Application tiled February 21, 1895- Serial No. 539,218. (N o model.)

with divided pin tumblers within holes in a cylinder, the tumblers being thrown forward by springs and pressed back by the key until the lines of separation between the two part y pins of the tumblers coincide with the divisionbetween the stationary and the moving portions of the lock, and in some instances the pin tumblers have been in line with the wards of the key so as to be pressed directly backward by the insertion of the key. In other instances the pin tumblers have been at right angles to the key and the wards or notches have been in the edge of the key. Inail locks of this character an expert lock-picker will endeavor to open the lock by applying a strain upon the cylinder that can be turned, and the imperfections in the workmanship will cause more pressure to rest against one of the divided tumblers than another, and by the insertion of a delicate pick in the slot for the key, the person can press against the tu mblers in succession and easily ascertain 4which one is exposed to the most friction and press upon that pin tumbler until the line of division coincides with the line ot' separation between the cylinder and the stationaryportion of the lock, and then the pick is applied to another tumbler, and so on until the lock can be opened.

The object of the present invention is to interpose a guard between the stationary and movable surfaces in locks having divided pin tumblers so that said guard effectually deceives a person attempting to pick the lock in the manner before described,this guard having a slight movement so that it yields and can turn partially with the moving portion of the lock. Hence when the tu mblers may have been set by a pick in the manner before described, the line of separation in the pin tu mblers will correspond to the line of separation between the cylinder and the guard instead of between the guard and the stationary portion ot' the lock, and the movement of the cylinder to open the lock is arrested by the pins in the stationary portion of thelock passing into -the guard and arresting the furthermotion, thus obtaining by the simple interposition ot` a guard plate between the stationary and` moving portions ofthe lock an effectual protection against the action of a pick.

In the drawings, Figure l is alongitudinal section representing the improved lock and the guard, with the guard as a liat disk between the end of the pin-cylinder and the stationary portion of the lock. Fig. 2 is a detached view of the guard and its connecting-pin. Fig. 3 is a longitudinal section illustrating the present improvement as applied around the pin-cylinder and with the two-part pin-tumblers at right angles to the key, and Fig. 4 is an external elevation of the guardcylinder and the pin upon the pin-cylinder.

It is to be understood that the present improvement may be applied to any character of lock having divided pin tumblers, and that the drawings illustrate the manner in which the present improvement may be applied to two well known `forms of pin locks.

A represents the cylinder that is slotted for the reception of the key B, and this cylinder A is held in any suitable stock or cylinder, as shown by the cylinder O, which has an internal fiange 2 for holding such cylinder A in position, and in that class of locks in which the cylinder A is provided` with a stem D firmly connected therewith and passing through the stationary portion E, such stem D is made use of for actuating the lock or latch by the rotation of such stem D and the cylinder C.

In other style of locks, such as illustrated in Fig. 3, the pin'cylinder A within the cylinder O is provided with a cam or projection adapted to act directly or indirectly upon the bolt to withdraw the same, and the portion E is stationary andforms a part of the lock case or socket within which the pin cylinder A can be turn ed.

In either class of locks the'divided pin tumblers F are in holes that are in line with each other in the parts A and E or A and E', and there are springs O to project the divided pin tumblers, and the construction and mode of operation of the parts thus far described IOC) spond to the holes iu the pin cylinder and" stationary portion of they lockso thatthedi-y vided pin tumblers slidethroughthe guard the same as though such guard formed an iutegral part of the pin cylinder, butinstead of being integral and moving therewith, there is a loose connection between the-guardand;

the` pin cylinder, such looseconnction: be-

ingadvantageously formedby afpin `inthe pin cylinder Ai or A? passing into a holein.; the guard G or Gr',` andthis hole is elongated? so that the pin may have a slight'` movement` When the key ist in the hole in the guard. inserted the lines ofseparation in the-.di-

videdipin tumhlers` areI brought tocoincide.

withrthelsurface of` thestationary portion or E ofthe lock, and'hence the-pincylinder A- orA and the guardfGorGf'turn together the same asl though) theywereintegral and? thellock can bcopenedlasusual; but it'l an. attempt ismade toipicki thelock by applyingarrotative force i to. the-` cylinder AtonA. and the pick is. applied` tofone after. another ot thepin tumblers to presstthemdn, the frictionagainstthe pin tumlolerstresults.` from the pressureon theoppositesidesof such pintumblers, andwheu the iendmotionf bringsthe vline of fseparation between the-two parts` of` the pin-l tumblersto uthe surface her.

tween the guard and thecyliuderfAiorA', af

i HAROLD 4SERRELL.

slight rotary movement is allowedtoLthe cylkluder A( andA theparty endeavoring to pick theloclp ndsthe pressure on that tumbler relieved, and the pick is applied to another tumbler, and when the effort is made to open the lock the pin cylinder can only turn the extent .of` motion that may be allowed by the elongation of the slot containing the pin 3 and the further movement of the parts is eilectually prevented. Thus the party endeavoring to pick the lock fails because the guard intervening between the stationary and moving portions` ol' the lock eftectually` prevents a knowledge being obtained of the location of `theline of separation between the hacker outer surface of the guard and the stationary portion of the-lock. Thusbythe simple interventionof. the guarduthepioloing of the lock lis. effectually prevented.

I claim asmfy inventionupon by the key, of a guardiintervening be "tween `thenlovable portionrand the stationary portionlandperforated for thepassage of the divided pin tumblers, and a loose connection betweenthe sainetaud `themoving portion of the lock, substantially as .set` forth.

dividedpintumblersand? stationary portion in` alcoli, offazguard intervening between the gpincy-liuder and the stationary. portion otfthe lock, s'uchguard ha ving holes for the `pin tumblers,.and a.pin.upon tlterpin` cylinder enteringan elongated boletin theguard; substantiallyr as set1forth.

Signed.: by lne this. lith day` of` February,

JNO; J. RIDGWAY.. Vlitnesses:

GEO T. PrNoKNnY,

l. The combinationin aloclrhaviugdivided` fpin tumblersn and a movable portion acted;

2: The combinationrwith theipin cylinder,` 

